fix author theme and messageinput background

packages/stream_chat_flutter/lib/src/message_actions_modal.dart

@@ -596,7 +596,7 @@ class _MessageActionsModalState extends State<MessageActionsModal> {
       elevation: 2,
       clipBehavior: Clip.hardEdge,
       isScrollControlled: true,
-      backgroundColor: StreamChatTheme.of(context).colorTheme.white,
+      backgroundColor: StreamChatTheme.of(context).channelTheme.inputBackground,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.only(
           topLeft: Radius.circular(16),

packages/stream_chat_flutter/lib/src/message_input.dart

@@ -234,7 +234,9 @@ class MessageInputState extends State<MessageInput> {
 
   @override
   Widget build(BuildContext context) {
-    Widget child = SafeArea(
+    Widget child = Container(
+      color: StreamChatTheme.of(context).channelTheme.inputBackground,
+      child: SafeArea(
         child: GestureDetector(
           onPanUpdate: (details) {
             if (details.delta.dy > 0) {
@@ -288,10 +290,10 @@ class MessageInputState extends State<MessageInput> {
             ],
           ),
         ),
+      ),
     );
     if (widget.editMessage == null) {
       child = Material(
-        color: StreamChatTheme.of(context).colorTheme.white,
         elevation: 8,
         child: child,
       );

packages/stream_chat_flutter/lib/src/message_list_view.dart

@@ -885,7 +885,7 @@ class _MessageListViewState extends State<MessageListView> {
       padding: const EdgeInsets.symmetric(horizontal: 8.0),
       showInChannelIndicator: showInChannelIndicator,
       showThreadReplyIndicator: showThreadReplyIndicator,
-      showUsername: showUsername,
+      showUsername: true,
       showTimestamp: showTimeStamp,
       showSendingIndicator: showSendingIndicator,
       showUserAvatar: showUserAvatar,

packages/stream_chat_flutter/lib/src/message_widget.dart

@@ -578,9 +578,7 @@ class _MessageWidgetState extends State<MessageWidget>
       if (showUsername)
         Text(
           widget.message.user.name,
-          style: widget.messageTheme.replies.copyWith(
-            color: widget.messageTheme.createdAt.color,
-          ),
+          style: widget.messageTheme.messageAuthor,
         ),
       if (showTimeStamp)
         Text(

packages/stream_chat_flutter/lib/src/stream_chat_theme.dart

@@ -206,6 +206,7 @@ class StreamChatThemeData {
         inputBackground: colorTheme.white.withAlpha(12),
       ),
       ownMessageTheme: MessageTheme(
+        messageAuthor: textTheme.footnote.copyWith(color: colorTheme.grey),
         messageText: textTheme.body,
         createdAt: textTheme.footnote.copyWith(color: colorTheme.grey),
         replies: textTheme.footnoteBold.copyWith(color: accentColor),
@@ -231,6 +232,7 @@ class StreamChatThemeData {
         reactionsMaskColor: colorTheme.whiteSnow,
         messageText: textTheme.body,
         createdAt: textTheme.footnote.copyWith(color: colorTheme.grey),
+        messageAuthor: textTheme.footnote.copyWith(color: colorTheme.grey),
         replies: textTheme.footnoteBold.copyWith(color: accentColor),
         messageLinks: TextStyle(
           color: accentColor,